Implement High Contrast mode for Chrome OS

chrome/browser/chromeos/accessibility/accessibility_util.cc

Index: chrome/browser/chromeos/accessibility/accessibility_util.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_util.cc b/chrome/browser/chromeos/accessibility/accessibility_util.cc
index 9704d35786238e0bd47a55f1b2dbc5b3f60ca5a3..253efe608c91d10aaf1cd9c3f3183f8d19b7765e 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_util.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_util.cc
@@ -6,6 +6,8 @@
 
 #include <queue>
 
+#include "ash/high_contrast/high_contrast_controller.h"
+#include "ash/shell.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
@@ -164,6 +166,10 @@ void EnableHighContrast(bool enabled) {
   PrefService* pref_service = g_browser_process->local_state();
   pref_service->SetBoolean(prefs::kHighContrastEnabled, enabled);
   pref_service->CommitPendingWrite();
+
+#if defined(USE_ASH)
+  ash::Shell::GetInstance()->high_contrast_controller()->SetEnabled(enabled);
+#endif
 }
 
 void EnableScreenMagnifier(bool enabled) {
@@ -205,6 +211,16 @@ bool IsSpokenFeedbackEnabled() {
   return spoken_feedback_enabled;
 }
 
+bool IsHighContrastEnabled() {
+  if (!g_browser_process) {
+    return false;
+  }
+  PrefService* prefs = g_browser_process->local_state();
+  bool high_contrast_enabled = prefs &&
+      prefs->GetBoolean(prefs::kHighContrastEnabled);
+  return high_contrast_enabled;
+}
+
 void MaybeSpeak(const std::string& utterance) {
   if (IsSpokenFeedbackEnabled())
     Speak(utterance);